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https://issues.apache.org/jira/browse/CALCITE-3970?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17099425#comment-17099425
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Julian Hyde commented on CALCITE-3970:
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[~vilo] I believe there are two different uses of {{TABLE}} in standard SQL.
One is for functions, another is for identifiers. For example, in PostgreSQL,
the following is valid:
{code}
select * from (table emp) as e;
{code}
So I think this bug is invalid.
> Table-valued function TUMBLE uses non-standard syntax
> -----------------------------------------------------
>
> Key: CALCITE-3970
> URL: https://issues.apache.org/jira/browse/CALCITE-3970
> Project: Calcite
> Issue Type: Bug
> Components: core
> Affects Versions: 1.22.0
> Reporter: Viliam Durina
> Priority: Major
>
> The currently supported syntax is this:
> {code:java}
> SELECT * FROM TABLE(TUMBLE(TABLE my_table, ...
> {code}
> But the SQL standard specifies that {{my_table}} must be in parentheses, such
> as here:
> {code:java}
> SELECT * FROM TABLE(TUMBLE(TABLE(my_table), ...
> {code}
> The second syntax is currently rejected with:
> {code:none}
> Exception in thread "main" org.apache.calcite.sql.parser.SqlParseException:
> Encountered "(" at line 1, column 33.
> Was expecting one of:
> <BRACKET_QUOTED_IDENTIFIER> ...
> <QUOTED_IDENTIFIER> ...
> <BACK_QUOTED_IDENTIFIER> ...
> <IDENTIFIER> ...
> <UNICODE_QUOTED_IDENTIFIER> ...
> {code}
> I'm not sure if the currently supported syntax is optional, but I think it's
> not.
> I followed this document:
> [http://standards.iso.org/ittf/PubliclyAvailableStandards/c069776_ISO_IEC_TR_19075-7_2017.zip]
> The {{TABLE}} clause acts in both ways: (1) to convert a table value to a
> table object (when used in the {{FROM}} clause to convert the function
> result) and (2) to convert a table object to a table value (when used to
> convert arguments to a function).
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